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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34104de3474c0a594a5cc5ef07a2617790d04b9a4a75ebd31929bf8c635a4f48' 
  AND token = '1gLDpP/yW8dL0bL+dXbMYvA+jD98bMnllB9H+KY7jyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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