SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb086976d90119aeeba6c73f48491b8f7c7959f2579236a3801b4e495e69d5b0' 
  AND token = 'wPUEt6u4m3q0xQBz8InIllVH6DC6hiCYCoYz5d+g1qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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