SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfb9f61cc4e19f7391b03db0be15eae57d2cce45166fad3aea8f40494789d19' 
  AND token = 'K+fIRKz/iYSDYKVUqWNOCh4WjsLThDi3wyX4wx0AHLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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