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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa2b8ac82855e3dbfd07f5ff5d933c26b6d442f509df9526c83fd4cf25ed98f' 
  AND token = 'ULuIYWQGTOT5L6Uxmb2oy4M3OJtGJ1lb8VD+OaLdqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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