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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb003f4214b8148a70db5749b1112aba40b91e6c298009bbf6b57204be0d479' 
  AND token = '32slBWqN/SPYFByjO2g5BsTVcf5rMi8YA1woBuDGhAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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