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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dda1d0ab91aa653881667abd655eb0c5296c28b8af02ab125979c5cba97f719' 
  AND token = 'q2Zm2CcMeHVMA06A80eyftOaVc5kPfqlShAsIQz4HAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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