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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9077f008b301a3c849c62d43f60f677d6cc8d213b12ad2e76ed47d8f280f9108' 
  AND token = 'O0VLi0cUlyFEY3uUWGIGf+HxzKF0/U1zup8aleE44DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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