SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a6eb32a46102b3561cf1e7c249fe8a8f2bf087255dc17d715c9958186c8bed' 
  AND token = 'LIPAXNsekkBJvixiFA2+ujRDnsqGGJNwP8QCAj4zR2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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