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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a078b73ff6f9d71246097a47ba1b66aa729559f8ac13424108ff3d7a31df5ed7' 
  AND token = 'lyn8zn9YmrFONfET61C+TgsHNf6NcAWJSHrSo118WdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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