SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d091f7ecebc129dc12e2fee56a03d556928f76a811f12da64bf5939e59e37c' 
  AND token = 'CtkhojKRTWk+KgwB9SqOhiKXsb8JiGNzKnfIKXKkEsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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