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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6c4326f30c807da7917717169e58149fd3719ebf08db8d178ee0b4b1606e3c' 
  AND token = 'mQsLH2tn7TfCVknxy9Ip9mrZhgE6Tp6V2VlKG1lqtIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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