SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4946ab0fdbc921e2fa58d2382b7dd8439ed8088c99af13c18c5f3cb0a516c5' 
  AND token = '/YVnHUY+a+Y7vS7VkdL2YLJDLa4VQWv20zGkHq/bnNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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