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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1d17b41ebed50369b2459cb3b04e6f8d42782ec34e88e560a9b73fd9d1baa9' 
  AND token = '0jrnyEg+1NwbY2C2IQ88ecTx+Fjpr58v/MVq1MeAhg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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