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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b165fdc47433de24488cf6c1d6f39e467f316211bd1a4fa76d1e6378fa1096' 
  AND token = 'lynBTQYGFlwmpfBciRx1KGLl1G8z0f+aOkZQM+LoLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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