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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600e523859e6bf18e4f2254b8a39234643b397ac15285570a9c669546ad7e951' 
  AND token = 'o1vxSJ2k7nT2XX8HDNl3sLU7DSJfidrGYS9savG3Wuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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