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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0e0ee328dc29710a7ff88edb0c899ce780a2598afe7405e6d9e540926e79bf' 
  AND token = 'ra7p4WmOti6YmEmg0C83pPIJaX0KdE4o3iyhOlyXObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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