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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80210c4d7b3e5b54b9ebce8c4a8f24d0b23f53a53921fae53067c2ddb0774274' 
  AND token = 'AGJrXKPLbM7pK6aj8bRV/udm+3pkprTirn/2oAN+R2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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