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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793201f73df8d7460a0bec7926d10d926b128a1c4749b0a91d4bcc6ab67a60d0' 
  AND token = 'bFGRUQXsxb6INumFlMZQS9B8DjjReTm2O44Izj+jTJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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