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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4fa0b0be69688ea1b4af5c9d61cc9b0f5b3ed3451117b80b9352b8a0f04948' 
  AND token = 'IDCN2/SubmxFdnYQHM35aYTw14o1GNQLdiihN647M6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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