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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cba7aa75d391f70e09e3a2541894bcab1af735aace39c68c96e1f17d7c7d119' 
  AND token = 'cgcf2JYy0+Her0cTjfW3ymGtfcbIj2CvurTx8PX0RGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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