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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23888c701709611ee0586e80f42ec984dc40d0ed3a8b9e3e2782d3e2ed1fd6a0' 
  AND token = 'A0xH9DCTO5PlgEBZozcMksgOAPITOMPiFNO7vBY8zEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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