SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9886461a857287d472f2e45ce07adab2800b7e3323f0fa44f55a1837918cc3' 
  AND token = '6Pc2+Do5VzScv0jGZG1ZLxlYWdoAoSuDB3BXPdGyPuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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