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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcfcf9d271c6a4f0d89b9b148011648b76ba54fc30d825e6b0950bf46df9513' 
  AND token = 'OnHF/NJAiQ/+Erg3JfASZv91E1qNZidT9hwAX9K1des=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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