Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dd86de828d4808bd9585485929f62124537f619ae1ca8968da8f56e0d0b3a0' 
  AND token = 'HmNEklgNhS8CxPjff0o+8JE69164GIKHcuSwTUJCvfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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