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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ab4e1cc0210ea43d42e2fbb9a37485acdbd3efb22311e82b69a82ebad76b41' 
  AND token = 'Pqg+ZH1am/WEfhOMAjfX6eRWFCuyWAkItSp4gk83Yok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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