SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d72d7e2ec42ee79b5859ae135e5a3f5785bb05105164bec92fbb8794f1e00b' 
  AND token = 'Hh4prUysih3JwWLrnFYxVwgcDZJdvWG4VL5KJk3sN/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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