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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1e3d90717a32c21e2aec91ab87d028c181d8d30fa3918ac2fc34c6f66ff21b' 
  AND token = 'NcNI/d8A0zo6oOv1P5sfqtxpoxCgfon5jgG+058PMLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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