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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd956e93ca1727adc6d9f2b7861bccfe8ef1585fbd2d6e5ab48df5e4d72c3b7ba' 
  AND token = 'JG8gG87vRt0lKI9hsx45q9byMjbHS0AUCw1qSiUvWo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}