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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d955c192f8be9ff78ef066b1a2bbc42825e1b4d99b6ce10da7418bcea56820f' 
  AND token = 'RN0xZGxt1LqTbOEUuOa0VqdQHCL48Xqx4RCFBTnWSeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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