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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34156fc35e9027da9953da94de9436e52812da7b2341d03fd5653971dee3dc7' 
  AND token = '6GeJQnEvuxhmjd2VqVeDcETXwdfsUxPpVNw0NSr8NOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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