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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ec6a6b9f043546a894116e256d68f89bae31f896ffc514bcf5b9fa6ca4693e' 
  AND token = 'bc44P6Ehr3xKob3fc47xlq4M+kH1e3uPuV2UAsC//pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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