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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a24d892e03f2a34de90f11479c48fe0940957b434850ad2c029f895ec33c35' 
  AND token = 'bue/xIZQURRdD/uNMR9xsU0D43AG3hFWJtT3bDBTDio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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