Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2b1dcff0a41786eec8ad0a804829a16083ed47964e0d1f5a26b1d411204c56' 
  AND token = 'YZUZYIRTC+KaRcJUmSgoTEnoBtZNtQ3gCTDzFwdmFZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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