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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fcb38a6e0ef54ac79e64488cd275cc09e0345e6a6aae487074b4e21ccac256' 
  AND token = '9Zx0ozlHgImsbki8etDLS04xHshAjXmpfXI6Rynxumk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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