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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98ce13221f8d0ec5c67bfc065ed7950101072a3d0c34b96dcf021c7b77e4047' 
  AND token = '8qJmqKaFpBd5PS4xmxOLQcYelynwBh4dVIwouO15xGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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