SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4980d0ff8c37d4b0326555fe6304fbb0520529c53a9f43a3b0af6f4ae71cac07' 
  AND token = 'UMaThV8L5CoJkuJY/HpEZpXDCOlX+XN3/m6B5PERTKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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