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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678ba290399c7e324b1a40488fc72962c7a486636a44f46a6604bc1fb62a1b6c' 
  AND token = 'IebabSo6UP/jKlPp4JX3fK+R5DVp7795Bvus+MJ54dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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