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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cc9dfbfa5950aa189b16cc1a9dd71b7ef0f4a2dcd7bb7a1ce22e1f0da2c1b8' 
  AND token = 'bYLG9jBCvg8mth8AGDChsI7+mSEGIF/DUzo93dFLsUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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