SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b0a9077b60d5fb4c27928f8122fc202cf499b678b6a2d36d026d84dcacf634' 
  AND token = 'zTm0ZEophUjw3PF8IOSYLCmpBoggHXwqJVeUZZlqfls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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