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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7690f0c3771bbbc44a542629ef1dbedf239632f5dbc9b0c8ac7d532ac48fdfc' 
  AND token = 'MratE9xDUAQ0HgW6CITAYMkVRCLzwq8jkvspPhNRHyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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