SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2850a5d870586924507b3cfc132cbbf3436f1a0969c38e6164824cd8677556' 
  AND token = 'y+U1zWlXkWLH7WQZyH7pweZVEXr2/6T+Qroqwf5O1FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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