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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089788f3bdd975a06ad5796f75b418747190fea1b7eae69acf754a80bec5822a' 
  AND token = 'dFou0Ygg4vce+eEYy88N1m8yUWzTRqlIvqm3bDzFj4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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