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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8faca015123a7eb0f4e6c989c6ad819a85a72ef86398b3d9adcd166d91193ce' 
  AND token = 'rgTEFa0PNzcT58+IVex3RipUn1UeBnBM9tliZU/xwJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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