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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c9ce1cbb3bc748ea3de50fea25b623ccc3e576ab6d21e584e4ba8d63ecc684' 
  AND token = 'YQH3cbn3o01Sx4yB1lh2g73lpmoGzNnDq2dj7xE/XHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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