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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d20417d5aeb79e0b5e34e421eee56276b684315d276be9e6809004aaaf53d35' 
  AND token = 'HomgN6BKJUZUEArOXIgv2LoOlm6uXwRsFUadPSwj9m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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