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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef0853d4e7edbba6c685bfe1cfdb44afaa40e6478ec7d59e95db9a69c8e01b2' 
  AND token = 'VGk9IJC5B8y8MQjxCxG22meBsHUEglV5n1NBO2RMYCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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