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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f112955a5a08d8c624aa6b4bfeec4bfb7795a6a64ac7e87b2540f3c0735acb0d' 
  AND token = '+zR7s93PI1UAo/MpZGa0t3JKTb2dUj8VE47qZaFpjNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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