SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3f9929dce6a42e64c7663a8feaa408cca35fab2c658b6b1827549ebe4e5038' 
  AND token = 'q7s9LSrA2+OrYjM/iqxifJdqVvNsKQVLMgdFv7oTK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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