SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bb01fac187208062558ac4e920b1652643e8ace7d984d67b9f0b1acc95f08f' 
  AND token = 'yjTSBpoPKNaqmkT+QZ5PFePqxDj5loYXriKAIVW7e0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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