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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af94e1fb7665ead9a4b27ff0c622a22c30f4de217bf85e0ee8d25433298bb3f2' 
  AND token = 'dFNumQBCf0bDCDLkL7IqfAZLmrxOs9O+v6AVSB15AKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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