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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deaeab1411e70972736773b19be86744e600e8ec6183e90131d04e37bfddae91' 
  AND token = 'nxJfVt5wWYZ8r3NWMl2/+OVmqol7pgNfYr6FxFDmaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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