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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720797d7dca3d8cacabf5cb3e65dff9a3df9d5025b7eafd3ad724e3180ec97ea' 
  AND token = 'B46LPSI4Imab56zVmy5GLF4LCL/3RibtH6KfZHfU57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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