SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84787e5cd52281360f64ed6a2faa7abc583fcf172f474ca6881bf5e55b7b4752' 
  AND token = 'pPhArle34uQYBgxSY3Zmu5WfBVUsxmkddA6pwvjqoLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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