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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac369c995658b3b50eb357914f75672ff7f1d462c57e334e37815518a40de5a9' 
  AND token = 'Ua3yUNXdEPAE9AoqSqOvVnSA0mrk+Aiv0UIQNhiXKkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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