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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874f44082c67b4f49846844fc44ef39b0913587b03024760f011dd2386568ca3' 
  AND token = 'BL+NTqdQWIuvxCXw+S24ktCT+DG3VBAjiEvT0TczVho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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