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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5085cce7a70687a3ac827a893a27cdc41cf115713ff2ad3e7e707dace1897b' 
  AND token = '6Tk8G8h6hC9hndI9cHZDRicsbD65nIi9NIvboJpgW3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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