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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a654a43c963c7da3635167bedcc5a334a02b34dd1731283c1ee3d98a1e06f78' 
  AND token = 'ccMfSiyyS/Uac+GOeMqmMmUcHwfC5V6cPDkNrsWaihI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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