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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263fcccd5fd775c9db76dd67fd20054a0e27880395bb535d8f03a4813560f3c4' 
  AND token = '1NDa0s3j11DqxEHe1YNV7/96ESTp+kmn5o1H73Yjq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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