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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed0d229cf7ce4ecae2405f26ebc0eb9044626216d91308029ee7cd19de3f394' 
  AND token = '8gT73Y2XM0DcjacsOfwwRe2Pxpviq3uQmkyayXfDrTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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