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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eabdbacc00bb66da7a73a0432192dcad4b06704dad37db3f90e179f2737926b' 
  AND token = 'G9eHwB2K8tTPQ7t5ZTvkNlZawGDVU892REgRmQs8k9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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