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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535d97293d7f2988fa9502c278ed0315aad6e32dab5ac3c655304869038af43e' 
  AND token = 'OCRbqfHQuy2TO3QyVRNq7iJwou4rKffyhGnvpjF6J9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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