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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debce5fc3cbf9db12c529ab9a926b7796a1ca0b437d9ebe40bf94869cd5202a9' 
  AND token = 'BRTNawT4FU1bQsE894HQ6NRNUN90SsoehdH7BEo+9Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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