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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a2d47487afaead71d0215e0af7b591796d41ab261a8b1bbb85b2d3727e1f64' 
  AND token = 'INartN4S8CskLOd5yCSceNvk+wJnjOVi+00HAc3l3GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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