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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f441eb2f1a3d8af4b9232bb1f1f7df4a66d1cc03f96bc54b668dfa38aa1499a7' 
  AND token = 'lQHlNG7sXccGo5WZyVn9LXagZoJqy75mXsfBa8vrzvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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