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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21af7a4cd81c43b5c365007da98f5124bfb906c472770c4381c6052302c132af' 
  AND token = '8aCW3xovypBe1vj9bJ6sVEXQMRnCfv6JWWQsx28mJj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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