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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8eb88318a91bc4fdf1992aa8b0c76c0d9be3b7b20a1392e4fa7208a0979f26' 
  AND token = 'Yqbc6Kdpx7l91Yo4axKIcjXFocVVWs0lzIgFsQjnYUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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