SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa561c9b18929f8436fe77cfe8366b1de025d5f1625665ae48fc4b49b70f0e83' 
  AND token = 'BeoDnR3qOsEV60gkvvr/UYzhptn0v+BGjYzEdQPq3i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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