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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6402e8b5f26bf26c03f6aa01502569af2ab2185aa62db115eb81e466c580d4f' 
  AND token = 'jrPqi/GhgtySlF/Vp6xDevBnLH6n4hS6SA8BxJZAN54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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