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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836a37cdf4b5e49777649607c704aadf60159b46f9790b092cccada3be7af3b7' 
  AND token = '7uoNR6UdA/AkMSfjNVYccAhdfE6oM5hR/FYREnlxqrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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