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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3b4fe4a085764f124b7f94103d9d7177d0ee4d8c39244aeff88165a15c7c17' 
  AND token = '4u8y/wVWzDlWo8Cf7tq/lz+1dBv88haS+xrgw/AqOrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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