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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cbc35b80dee56437609e2e6bd2d10ec5beea1892846cbe3912b306462be8c5' 
  AND token = 'w6eU15DdktyuUQXUzyqIUnWAd6yamXDMpl3a3D7RhPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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