SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d483a805594d7dc8c555608318f0128500c5a54094ce3bba618647ce0303f7' 
  AND token = 'OmaOR1FW/Pjf/RhPLJi/HVYFDZtCKb+w4PMv0MlopOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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